code: def testStat(self):
      file_path = os.path.join(self._base_dir, "temp_file")
      gfile.GFile(file_path, mode="w").write("testing")
      file_statistics = gfile.stat(file_path)
      os_statistics = os.stat(file_path)
      self.assertEqual(7, file_statistics.length)
  
imports: import os.path
  from tensorboard import test
  from tensorboard.compat.tensorflow_stub import compat, errors
  from tensorboard.compat.tensorflow_stub.io import gfile
label_desc: Use image node_id 18 for calling the FileIoTest obj's underlying member method code with example usage: obj.testStat() without return types